Extrusion & Post
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EMA Film Poor Printing Adhesion
Problem Phenomenon
After printing on EMA film, ink adhesion
Cause Analysis
Poor affinity between EMA surface polarity and ink; corona treatment effect decays fast; ink system does not match EMA
Solution
1) Print immediately after corona treatment, within 24h; 2) Use EMA-specific ink; 3) Increase corona power to 15-20kW/m² to ensure surface tension >42mN/m; 4) Flame treatment to assist surface polarization
Key Takeaway
Poor printing adhesion is caused by insufficient surface polarity; corona treatment and special ink are key
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